Chevrolet 2003 Astro Owner's Manual page 82

This vehicle has one The bar-coded tag has a code on it that tells your
double-sided key for the dealer or a qualified locksmith how to make extra keys.
ignition and door locks. Keep this tag in a safe place. If you lose your keys,
It will fit with either side up. you'll be able to have new ones made easily using
this tag.
Notice: Your vehicle has a number of features that
can help prevent theft. You can have a lot of trouble
getting into your vehicle if you ever lock your keys
inside. You may even have to damage your vehicle to
get in. So be sure you have spare keys.
If you ever do get locked out of your vehicle, call GM
Roadside Assistance Center. See Roadside Assistance
Program
on
page
7-6.
When a new vehicle is delivered, the dealer provides the
owner with a pair of identical keys and a bar-coded tag.
2-3